Apple imac 17 inch User Manual

							
I/O Port Covers

Tools 
This procedure requires the following tools: 
• No tools are required 
Part Location 
Preliminary Steps 
Before you begin, do the following: 
• Position the computer in the service stand. 
• Remove the user access plate. 
• Remove the bottom housing. 
• Remove the RJ-11 board 
• Remove the logic board. 
28 iMac (Flat Panel) Take Apart
 I/O Port Covers  
						

							
Procedure 
1. Gently remove the I/O port covers from the logic board. 
Warning: Whenever the bottom housing is opened for service, you must do two things: 
1.You must clean the original thermal film from the surfaces joining the\
 thermal 
interface layer and reapply thermal paste to the thermal pipe. 
2. You must tighten the four torx screws on the bottom housing to a minimu\
m of 17 
in.-lbs. If you do not have a torque driver, you will have to make sure \
these 
screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the \
service tool (076-0899) in order to ensure the thermal pipe is firmly \
mated with the top base. If the bottom housing is not securely attached \
to the 
base in this fashion, the CPU may overheat and become damaged.
 Failure to 
follow either of these steps could cause the computer to overheat and da\
mage 
internal components. 
Refer to the topic, “Thermal Paste Application” for detailed infor\
mation. 
I/O Port Covers  iMac (Flat Panel)  Take Apart -
29 
						

							
Thermal Pad Installation

Tools 
• No tools are required. 
• Thermal pad kit 
Part Location 
Warning: Whenever the logic board is removed, you must install new thermal pads to 
three surfaces (shown above). Failure to apply these pads could cause the computer to 
overheat and possibly damage the internal components.  Note:
 An exception would be if 
you are simply testing the logic board and only detach it for a few minu\
tes
. 
30  iMac (Flat Panel) Take Apart
 Thermal Pad Installation  
						

							
Procedure 
1.	Remove the old thermal pads (shown below) from the bottom housing. Note:  If you 
don’t see all three thermal pads on the bottom housing, check the bottom side of the 
logic board. The thermal pads may stick to the logic board. Either way, remove the old 
thermal pads. 
2.	Using the thermal pad kit, remove the clear protective backing from the new thermal 
pads. 
3.	Place the new thermal pads on the bottom housing. Press down on the blue protective 
backing to make sure the thermal pad has even contact with the bottom housing. 
There should be no air pockets. 
4.	Remove the blue protective backing from the new thermal pad.  Note: Avoid 
unnecessary contact with either side of the thermal pad as dirt and body oils reduce 
the thermal pad's conductivity. 
5.	Holding the logic board by the battery retainer and the internal drive cable connector, 
slide the logic board back into the bottom housing (make sure the I/O port covers are 
on the logic board).  Important: Do not push on the heatsink for leverage, as you could 
knock it off the chip. 
Thermal Pad Installation	 iMac (Flat Panel)  Take Apart -
31 
						

							
AC Line Filter 

Tools 
This procedure requires the following tools: 
• Torx-10 screwdriver 
Part Location 
Preliminary Steps 
Before you begin, do the following: 
• Position the computer in the service stand. 
• Remove the user access plate. 
• Remove the bottom housing. 
• Remove the RJ-11 board. 
• Remove the logic board. 
32 iMac (Flat Panel) Take Apart
 AC Line Filter  
						

							
Procedure 
1.	Peel back the black insulator on the bottom housing to access the AC line filter 
screws. 
2.	Remove two screws and lift the AC line filter from the bottom housing.  Note: The AC 
line port cover plug may fall out of the bottom housing when you remove the AC line 
filter. Place the plug back into the bottom housing before reinstalling the AC line filter. 
AC Line Filter	 iMac (Flat Panel)  Take Apart -
33 
						

							
Warning: Whenever the bottom housing is opened for service, you must do two things: 
1.You must clean the original thermal film from the surfaces joining the\
 thermal 
interface layer and reapply thermal paste to the thermal pipe. 
2. You must tighten the four torx screws on the bottom housing to a minimu\
m of 17 
in.-lbs. If you do not have a torque driver, you will have to make sure \
these 
screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the \
service tool (076-0899) in order to ensure the thermal pipe is firmly \
mated with the top base. If the bottom housing is not securely attached \
to the 
base in this fashion, the CPU may overheat and become damaged.
 Failure to 
follow either of these steps could cause the computer to overheat and da\
mage 
internal components. 
Refer to the topic, “Thermal Paste Application” for detailed infor\
mation. 
Warning:  Whenever the logic board is separated from the bottom housing, you must 
install new thermal pads to three surfaces on the bottom housing. The thermal pads help 
cool components on the logic board. Failure to apply these pads whenever the logic board 
is separated from the bottom housing could cause these parts to overheat. Short term 
separation, where the thermal pads are not handled excessively 
(an exception would be 
if you are simply testing the logic board and only detach it for a few m\
inutes)
, 
does not require replacement.
 Refer to “Thermal Pad Installation” in this chapter for detailed information. 
34  iMac (Flat Panel) Take Apart
 AC Line Filter  
						

							
Drive Carrier Assembly (Optical 
and Hard Drive) 
Tools 
This procedure requires the following tools: 
• Torx-10 screwdriver 
Part Location 
Preliminary Steps 
Before you begin, do the following: 
• Position the computer in the service stand with the door facing up. 
• Remove the user access plate. 
• Remove the bottom housing. 
Drive Carrier Assembly (Optical and Hard Drive) iMac (Flat Panel)  Take Apart -
35 
						

							
Procedure 
1.	Rotate the base unit so the optical drive door is facing up (as shown below). 
2.	Remove two screws on the EMI shield. Carefully lift the shield and peel the copper 
tape off the drive. 
36  iMac (Flat Panel) Take Apart	
 Drive Carrier Assembly (Optical and Hard Drive)  
						

							
3. Remove four screws attaching the drive carrier to the metal chassis (also known as 
the Faraday cage). 
Drive Carrier Assembly (Optical and Hard Drive)  iMac (Flat Panel)  Take Apart -
37